Arctic Theme Page – http://www.arctic.noaa.gov/
This National Oceanic and Atmospheric Administration site provides Arctic information and a set of reputable indicators that describe the present state of the Arctic ecosystem and climate.

Lichens of North America – http://www.lichen.com/
This informative site includes the biology and ecology of North American lichens, as well as human and wildlife uses of lichens. It is illustrated with numerous photos of the many kinds of lichens.